By using the method of multi ・ variable analysis , 66 District Heating and Cooling( DHC )systems in Japan have been evaluated in . the aspects of business pro 丘ts, energy ・ saving and environmental protection , amenity and safety . We get the result that the business profits are affected by the f ( } 110wing factors : the plant arealheat demand area , heat price, operation rate , total district pipe length ! heat demand , heat demand density , and the maximum of heat demandlthe average heat

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... nd . In the one ・ variable analysis , about 3% DHC systems have low business pro 丘ts. COP is the most important factor in the energy saving and env 廿onmental evaluation , and about 24 % have good performance in this aspect . 27% have good perf( )rmance in amenity and safety evaluation . In the multi ・ variable analysis evaluation , Type ・ S6 has best business profits among these 7 types, Type ・ S7 has best energy saving and environmental protection perft 〕rmance , and Type ・ S5 has best amenity and safety . According to the order of evaluation index presented in this article , we can find the problems of existing DHC systems and their solutions .